Companies that sell mosquito repellants are trying to suck New Yorkers dry by touting “Zika-preventive” products like bracelets, patches and ultrasonic devices that are completely ineffective, officials said Wednesday.

The letters demand they immediately quit running ads for products that are promoted to be “Zika protective” or “Zika-preventive.”

“Unfortunately, there are some companies taking advantage of public concern about Zika to peddle other products, such as ultrasound devices, vitamin B products, [which] have proven to be ineffective,” Attorney General Eric Schneiderman said at a press conference with city Health Commissioner Dr. Mary Bassett and state Sen. Adriano Espaillat.

Schneiderman also issued a consumer alert warning about the false advertisements and directed the public to Zika-prevention measures and brands that have been scientifically proven to work and recommended by public-health ­officials.